Hello and welcome to the Fitbit Community @J226
I’m sorry to see you’re having difficulty setting up your new Fitbit. I think this article will really help:https://help.fitbit.com/articles/en_US/Help_article/1872?q=set+up&l=en_US&fs=Search&pn=1
😃 Please let me know if this helps. Keep me posted.
@J226 An Invalid Device Number error code is one that occurs when there is a fundamental problem with the device itself. Please contact Support for more help.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.